diff --git a/Readme.md b/Readme.md
index 84ecdce..4700602 100644
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@@ -33,7 +33,7 @@ Create a new model for the SBus Gamepad on your transmitter. Make sure that you
 
 ## Testing
 
-All testing was done using a Teensy 2.0 and the 16 channel FrSky XM receiver (no other hardware was used). Shoud you need to adjust the range of the sbus values sent by your transmitter please edit the X1, X2 macros in the SBus.h file and rebuild.
+All testing was done using a Teensy 2.0 and the 16 channel FrSky XM receiver (no other hardware was tested). Shoud you need to adjust the range of the sbus values sent by your transmitter please edit the X1, X2 macros in the SBus.h file and rebuild. The Teensy needs to run with 5 volts to be a full speed USB device. Also the FrSky XM receiver needs the 5 volts to operate (output of the sbus signal is 3.3 volts though). Total power consumption should be around 50 ma at 5 volts (30 ma for the Teensy and 20 ma for the XM receiver).
 
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